don't worry about the CTR if the traffic is less. But if you have have extremely high CTR then u have to worry, for example 5000 clicks for 10,000 page views is not a good sign
That's fine since only 1 click. However, when you get 100 impression with 100% CTR, then you might be in trouble...lol
if u have one impression and 1 click, then it will be 100% ctr which is nothing to be worried about. if you had lot more traffic with 100% ctr, then you need to worry